Choosing non-metallic compensator, the most afraid of manufacturers only selling it or not
Two days ago, a peer spat with me. The last project chose the wrong compensator model. After three months of installation, it bulged and leaked, and more than 200,000 yuan was put in for maintenance. In fact, the service of non-metallic compensators is good, not the polite words of sales, but the ability to help users save real money in several key links. After more than ten years of pipeline engineering, I have seen too many cases of "cheap when buying and expensive when using"-the price difference is several thousand yuan, tens of thousands of yuan are thrown in later maintenance, and the general ledger is lost.
Good service begins to land from the selection
Similarly, when dealing with high-temperature flue gas, you take rectangular non-metallic expansion joints (that is, fabric fiber expansion joints) to deal with oily coking media, that is, dig a hole for yourself. Professional service providers will first ask about the media composition, temperature fluctuation range, pipeline displacement direction and amount, and then help you match non-metallic expansion joints (fabric fiber expansion joints) or rubber PTFE compensators. For example, the wet flue gas in the desulfurization system is highly corrosive, and the PTFE-lined hose and PTFE compensator are more resistant to manufacture. If this step of selection is right, the follow-up maintenance cost can be cut by half-in the projects I handle, if I spend half an hour communicating with the manufacturer in the early stage, the failure rate in the later stage will be reduced by at least 60%.
Then how to judge whether the service provider is reliable or not? Very simple, see if he will chase you and ask "are there any particles in the medium" and "is the displacement axial or lateral". Those who only ask you to quote a caliber can basically pass.
Non-standard customization is the touchstone of service level
Many peers think that non-standard customization is "changing the size", which is a big mistake. The true non-standard should consider the direction of thermal expansion, pressure level, and even the location of the hoisting point. A good supplier will clearly mark the adjustment space of the expansion joint tie rod nut and whether the screw needs to be removed in the 3D model-these details are particularly useful at the installation site. Otherwise, when you arrive at the scene, you find that the wrench doesn't fit in, and that's called blindness.
Installation and aftermarket are not a formality
The non-metallic compensator is sensitive to the installation accuracy. If the tie rod nut is not adjusted properly, the pre-tension is not done correctly, and the life is directly halved. A good service team will send people to the scene to stare at the clothing, and simultaneously teach you how to adjust the tie rod nut of the expansion joint and whether the screw of the expansion joint needs to be disassembled. For example, how to adjust our common expansion joint tie rod nut? The standard practice is to loosen the locking nut first, let the tie rod be in a free state, and then lock it after the cold displacement of the pipe is in place. However, many sites were screwed to death directly in order to save trouble, and as a result, the compensator was cracked as soon as the temperature rose.
In addition, they are generally not in a hurry to send the goods away, but ask in advance if there are any pressure test requirements and whether they need to run with them for a period of time. This kind of "real" service saves the general contractor the energy of arguing in the later period. Think about it, if the manufacturer doesn't even ask for pressure test before delivery, and when he arrives at the site, he finds that the pressure level is wrong, and the back-and-forth exchange will delay the construction period, and the loss will be more than the freight.
Tell me a real case
Last year, a power plant installed desulfurization flue gas baffle door and circular baffle door (double seal) system, and the matching non-metallic compensator always had fiber layer tearing. The investigation of the supplier with good service found that it was not a product quality problem, but an additional displacement caused by insufficient stiffness of the pipe support. They helped users reinforce supports and hangers for free, and also reviewed the adjacent rotary compensators. Since then, the power plant has directly included this non-metallic compensator in the preferred list.
You see, good service means that it can help you eliminate hidden dangers from the root cause, instead of just changing parts. For the same fault, ordinary manufacturers will tell you "buy another one and replace it", at most a discount. But a good service provider can help you diagnose the problem of the whole system clearly-sometimes the problem is not the compensator itself at all, but the pipeline stress design is not correctly calculated.
To put it bluntly, the service of non-metallic compensator is good, and the essence is to help users reduce the whole life cycle cost
From selection consultation, non-standard customization, installation guidance to fault diagnosis, the time, downtime and maintenance costs saved in each ring add up to far more than that product price difference. For example, a standard non-metallic expansion joint may be 2,000 yuan more expensive than other manufacturers, but if it can serve for two more years without problems, the annual cost will be lower. Add in the saved downtime losses-it is common for a medium-sized factory to lose fifty thousand a day when it stops production. This account, if you understand it, you will know that service is not a cost, but an investment.